Do I have abs or not?

[elweasel at bellsouth.net]

When I bought the 1990 80 Quattro, the ad stated that the car has abs. Now he did state that the master cylinder needed replacing. He included a used replacement.  Now this is like the MC that I removed from the quattro.
http://i273.photobucket.com/albums/jj211/elweasel/audi/qi6611210-2.jpg

This is like the MC that the guy included.
http://i273.photobucket.com/albums/jj211/elweasel/audi/41W6usFJl2L__SS400_.jpg

At first I did not notice that the two are different. Not until all the brake fluid leaked onto the floor.
After reading the bentley guide, I still can not find the abs unit. I traced the brake line and it goes from the proport. valve to the wheel. It never goes to the abs unit. So I think the car had abs, got into an accident and to cheaply fix it, replaced the brakes with non-abs brakes. My problem now is I don't know which MC to buy. I think the non-abs master cylinder. Any opinions? Thanks